Might mean (unverified): Early mollusks with conical shells.
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We found 2 dictionaries that define the word helcionellid:

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  1. helcionellid: Wiktionary
  2. Helcionellid: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (helcionellid)

noun:  (zoology) Any extinct mollusk in the family Helcionellidae.

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